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Aug 21 at 12:11 comment added Pietro Majer Beautiful! This would also be a fine answer for proofs without words, mathoverflow.net/questions/8846/proofs-without-words
Aug 21 at 11:41 comment added Timothy Chow It shows a little more, namely a hinged dissection between the two shapes.
Aug 20 at 21:11 comment added Gro-Tsen This is the same answer as Douglas Zare's.
Aug 20 at 20:58 history answered Jack D'Aurizio CC BY-SA 4.0